Pyroxylin solvent



UNITED STATES PATENT OFFICE.

ROWLAND BRITTAIN IEITCEELLyOI ATHOL, MASSACHUSETT S ASSIGNOR TO JATHOL MANUFACTURING COMPANY, OF ATHOL, MASSACHUSETS, A GORPGRATION OF Patented Nov. 15, 1921.

. MASSACHUSETTS.

PYROXYLIN SOLVENT.

1 3i97 493 Specification of Letters Patent.

No Drawing.

To all whom it may concern:

Be it known that I, ROWLAND B. MITCHELL, a citizen of the United States, residing at Athol, in the county of Worcester and State of Massachusetts, have invented certain Improvements in Pyroxylin Solvents, of which the following description is a specification This invention relates to solvents for pyroxylin and is of particular utility in.

tice and it produces good artificial leather when used commercially. Care should be taken to remove the water from all the constituents of the mixture owing to the well known fact that water must not be present in pyroxylin solvents.

Other suitable solvents may be used 'to re-- place a part of the ethyl propionate if desired.-

The following tables give such a diluted" solution, which I have found successful and which is at present cheaper, owing'to the fact that ethyl acetate is now cheaper than ethyl propionate, but I prefer the ethyl propionate unmixed with the acetate.

Ethyl pro-pionatel 20% Ethyl acetate 10% Toluol- Ethyl alcohol 20% Ethyl alcohol (not a solvent) may be added and I recommend such addition. I prefer the following proportions for the solution:

Ethyl propionate 30% $611 101-" 50% Ethyl alcohoL'-..1- 2

Application filed August 21, 1920. Serial No. 405,053.

It will readily be appreciated by those skilled in this art that the exact proportions of the ingredients will vary with the requirements of the product, the nature of the process in which it is used, and the conditions under which the-process is practised. It will also be understood that other substances than those particularly mentioned above can be used with ethyl propionate and toluol. I

For the purpose of coating fabrics a solution of pyroxylin in this solvent is made, the percentage of pyroxylin used varying widely with the requirementsof the product, and a coating of this solution then is spread on the fabric afterwhich the solvent is evaporated. The pyroxylin dissolves readily indeed in this solvent, it spreads smoothly, and dries without wrinkles or bloom if given proper treatment and if all water is eliminated from the materials.

A good artificial leather is produced economically with great ease by the use of this solvent.

The. solvent containing ethyl acetate is not specifically claimed herein but this compound is specificall claimed in my divisional application February 9 ,1921.

What is claimed as new is:

1. A solvent for pyroxylin containing 'ethyl propionate and toluol.

2. A solvent for pyroxylin containing substantially three parts of ethyl propionate,

five parts of toluol, and two parts of ethyl alcohol.

3. A solvent for pyroxylin containing substantially three parts of ethyl propionate,

five parts of toluol, and a substantial proportion of ethyl alcohol.

erial No. 443,629 filed -4. ,A solvent for pyr'oxylin containing I ethyl propionate, toluol, and ethyl alcohol.

In testimony whereof I. have signed my v name to this specification.

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